From d8524c73696392c7e895e6b3fe4c7e120d7296f7 Mon Sep 17 00:00:00 2001 From: Jakob Unterwurzacher Date: Sun, 3 Jul 2016 20:17:40 +0200 Subject: syscallcompat: OSX: add Unlinkat wrapper Also, replace remaining naked syscall.Openat calls. --- internal/fusefrontend/fs.go | 4 ++-- internal/fusefrontend/fs_dir.go | 6 +++--- internal/nametransform/diriv.go | 3 ++- internal/nametransform/longnames.go | 5 +++-- internal/syscallcompat/sys_darwin.go | 18 ++++++++++++++++++ internal/syscallcompat/sys_linux.go | 4 ++++ 6 files changed, 32 insertions(+), 8 deletions(-) (limited to 'internal') diff --git a/internal/fusefrontend/fs.go b/internal/fusefrontend/fs.go index 561af8f..279c755 100644 --- a/internal/fusefrontend/fs.go +++ b/internal/fusefrontend/fs.go @@ -133,7 +133,7 @@ func (fs *FS) Create(path string, flags uint32, mode uint32, context *fuse.Conte // Create content var fdRaw int - fdRaw, err = syscall.Openat(int(dirfd.Fd()), cName, iflags|os.O_CREATE, mode) + fdRaw, err = syscallcompat.Openat(int(dirfd.Fd()), cName, iflags|os.O_CREATE, mode) if err != nil { nametransform.DeleteLongName(dirfd, cName) return nil, fuse.ToStatus(err) @@ -295,7 +295,7 @@ func (fs *FS) Unlink(path string, context *fuse.Context) (code fuse.Status) { } defer dirfd.Close() // Delete content - err = syscall.Unlinkat(int(dirfd.Fd()), cName) + err = syscallcompat.Unlinkat(int(dirfd.Fd()), cName) if err != nil { return fuse.ToStatus(err) } diff --git a/internal/fusefrontend/fs_dir.go b/internal/fusefrontend/fs_dir.go index 699ec7b..ab97932 100644 --- a/internal/fusefrontend/fs_dir.go +++ b/internal/fusefrontend/fs_dir.go @@ -114,7 +114,7 @@ func (fs *FS) Rmdir(path string, context *fuse.Context) (code fuse.Status) { defer parentDirFd.Close() cName := filepath.Base(cPath) - dirfdRaw, err := syscall.Openat(int(parentDirFd.Fd()), cName, + dirfdRaw, err := syscallcompat.Openat(int(parentDirFd.Fd()), cName, syscall.O_RDONLY, 0) if err == syscall.EACCES { // We need permission to read and modify the directory @@ -136,7 +136,7 @@ func (fs *FS) Rmdir(path string, context *fuse.Context) (code fuse.Status) { // Retry open var st syscall.Stat_t syscall.Lstat(cPath, &st) - dirfdRaw, err = syscall.Openat(int(parentDirFd.Fd()), cName, + dirfdRaw, err = syscallcompat.Openat(int(parentDirFd.Fd()), cName, syscall.O_RDONLY, 0) // Undo the chmod if removing the directory failed defer func() { @@ -191,7 +191,7 @@ func (fs *FS) Rmdir(path string, context *fuse.Context) (code fuse.Status) { return fuse.ToStatus(err) } // Delete "gocryptfs.diriv.rmdir.XYZ" - err = syscall.Unlinkat(int(parentDirFd.Fd()), tmpName) + err = syscallcompat.Unlinkat(int(parentDirFd.Fd()), tmpName) if err != nil { tlog.Warn.Printf("Rmdir: Could not clean up %s: %v", tmpName, err) } diff --git a/internal/nametransform/diriv.go b/internal/nametransform/diriv.go index b9473aa..51af1c3 100644 --- a/internal/nametransform/diriv.go +++ b/internal/nametransform/diriv.go @@ -9,6 +9,7 @@ import ( "syscall" "github.com/rfjakob/gocryptfs/internal/cryptocore" + "github.com/rfjakob/gocryptfs/internal/syscallcompat" "github.com/rfjakob/gocryptfs/internal/tlog" ) @@ -35,7 +36,7 @@ func ReadDirIV(dir string) (iv []byte, err error) { // ReadDirIVAt reads "gocryptfs.diriv" from the directory that is opened as "dirfd". // Using the dirfd makes it immune to concurrent renames of the directory. func ReadDirIVAt(dirfd *os.File) (iv []byte, err error) { - fdRaw, err := syscall.Openat(int(dirfd.Fd()), DirIVFilename, syscall.O_RDONLY, 0) + fdRaw, err := syscallcompat.Openat(int(dirfd.Fd()), DirIVFilename, syscall.O_RDONLY, 0) if err != nil { tlog.Warn.Printf("ReadDirIVAt: opening %q in dir %q failed: %v", DirIVFilename, dirfd.Name(), err) diff --git a/internal/nametransform/longnames.go b/internal/nametransform/longnames.go index 13bedb3..cf7f34c 100644 --- a/internal/nametransform/longnames.go +++ b/internal/nametransform/longnames.go @@ -9,6 +9,7 @@ import ( "strings" "syscall" + "github.com/rfjakob/gocryptfs/internal/syscallcompat" "github.com/rfjakob/gocryptfs/internal/tlog" ) @@ -65,7 +66,7 @@ func ReadLongName(path string) (string, error) { // DeleteLongName deletes "hashName.name". func DeleteLongName(dirfd *os.File, hashName string) error { - err := syscall.Unlinkat(int(dirfd.Fd()), hashName+LongNameSuffix) + err := syscallcompat.Unlinkat(int(dirfd.Fd()), hashName+LongNameSuffix) if err != nil { tlog.Warn.Printf("DeleteLongName: %v", err) } @@ -86,7 +87,7 @@ func (n *NameTransform) WriteLongName(dirfd *os.File, hashName string, plainName cName := n.EncryptName(plainName, dirIV) // Write the encrypted name into hashName.name - fdRaw, err := syscall.Openat(int(dirfd.Fd()), hashName+LongNameSuffix, + fdRaw, err := syscallcompat.Openat(int(dirfd.Fd()), hashName+LongNameSuffix, syscall.O_WRONLY|syscall.O_CREAT|syscall.O_EXCL, 0600) if err != nil { tlog.Warn.Printf("WriteLongName: Openat: %v", err) diff --git a/internal/syscallcompat/sys_darwin.go b/internal/syscallcompat/sys_darwin.go index 7d39484..6300317 100644 --- a/internal/syscallcompat/sys_darwin.go +++ b/internal/syscallcompat/sys_darwin.go @@ -69,6 +69,24 @@ func Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err e return syscall.Rename(oldpath, newpath) } +// Poor man's Unlinkat +func Unlinkat(dirfd int, path string) (err error) { + chdirMutex.Lock() + defer chdirMutex.Unlock() + if !filepath.IsAbs(path) { + oldWd, err := os.Getwd() + if err != nil { + return err + } + defer os.Chdir(oldWd) + } + path, err = dirfdAbs(dirfd, path) + if err != nil { + return err + } + return syscall.Unlink(path) +} + // dirfdAbs transforms the dirfd-relative "path" to an absolute one. If the // path is not already absolute, this function will change the working // directory. The caller has to chdir back. diff --git a/internal/syscallcompat/sys_linux.go b/internal/syscallcompat/sys_linux.go index e12d100..ded5d17 100644 --- a/internal/syscallcompat/sys_linux.go +++ b/internal/syscallcompat/sys_linux.go @@ -48,3 +48,7 @@ func Openat(dirfd int, path string, flags int, mode uint32) (fd int, err error) func Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error) { return syscall.Renameat(olddirfd, oldpath, newdirfd, newpath) } + +func Unlinkat(dirfd int, path string) error { + return syscall.Unlinkat(dirfd, path) +} -- cgit v1.2.3